I think it is not about filling it... but more about how close are you getting your filter to the dirt... right?
Because our 5 gallon I would fill with about 2/3 inches of water after sucking out 4 carpets or so twice. Plus the dirt then and the filter is only an inch or so away from all that crap.
Because our 5 gallon I would fill with about 2/3 inches of water after sucking out 4 carpets or so twice. Plus the dirt then and the filter is only an inch or so away from all that crap.

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